[R2Pro] Mic-Switch

Hi,

it looks like r2pro misses MIC-connection in headphone-jack…but it does not make sense to use a 4-pin-jack instead of a 3pin

grafik

mic seems to connected only to on-board-mic, can someone from bpi configm, that mic on headphone cannot work? can this be changed to drop on-board-mic and connect it to the 4pin-jack?